Inelastic columns subjected to pulse loading.

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Abstract

This paper reports an investigation of the dynamic behavior
of a pin-ended inelastic column subjected to a half-sine displacement
pulse at one end applied with small eccentricity,,
The rates of end displacement are such that the effects of
axial inertia are considered negligible,, The column is replaced
by a lumped parameter mathematical model and the equations
for the model are solved by a high speed digital computer.
The stress-strain relation during loading is assumed
to be of the Ramberg-Osgood type„ Unloading occurs along a
line with slope equal to that of the tangent at the origin,,
Slendemess ratios of 50, 70, and 100 and two different values
of eccentricity are considered in the investigation. The maximum
load supported by the column and the residual lateral
deflection at the center of the column are found as functions
of the displacement pulse height and of the displacement pulse
duration.
It Is shown that an inelastic column, like the elastic
column, can support dynamic loads considerably in excess of
the static load capacity. It Is also shown that within the
range of pulse durations studied, the smallest residual deflections
generally accompany the largest maximum loads.

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